/in/foo.cc: In function 'void solve(int, int)':
/in/foo.cc:21:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=L+R>>1;
          ~^~
/in/foo.cc:29:7: warning: unused variable 'x' [-Wunused-variable]
   int x=q1[i].x,y=q1[i].y;
       ^